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@ 2023-05-06T07:40:52Z

<?php

function test($str)
{
    if (ltrim($str, 'A..Za..z0..9.') !== '') {
        return 'found a bad character';
    } else {
        return 'all good';
    }
}

foreach (['good', 'b@d', '$÷*'] as $s) {
    printf("%s : %s\n", $s, test($s));
}

Output
Performance
VLD
References
Branches

ltrim: documentation ( source)
printf: documentation ( source)

preferences:dark modelive previewkey bindings

27.72 ms | 405 KiB | 5 Q